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b12 injection site reactions Possible allergic reaction to injections?? : r/B12_Deficiency Vitamin B12 Side Effects
Description
Other contra-indications include persons who are: Nursing or pregnant
refrigerate PEER-REVIEWED EVIDENCE Kraus D, Yang Q, Kong D, et al

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5.The frequency of injections varies, typically once a week, based on individual needs and medical advice

This may occur due to aging, certain diets, or medications such as Metformin, which is commonly used to treat diabetes
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